The paper presents the results of theoretical and experimental research related to the uncertainty in the elastic modulus measurement on different types of tensile testing devices and their comparison. Factors that affect the uncertainty in the measurement of the elastic modulus were defined. Analytical limits of the uncertainty in the elastic modulus, i.e. the limits of “acceptable” uncertainties, were determined. The mean values of the uncertainties in the elastic modulus are 1.97% on a conventional tensile testing device with an extensometer and 1.56% on a small laboratory tensile testing device. In the region of lower forces and small elongations, the uncertainty in the elastic modulus measurement has higher values, which is primarily caused by the imperfections of measuring instrumentation.

本文介绍了与不同类型拉伸试验装置的弹性模量测量不确定度相关的理论和实验研究结果及其比较。定义了影响弹性模量测量不确定度的因素。确定了弹性模量不确定度的分析极限，即“可接受”不确定度的极限。弹性模量不确定度的平均值在带有引伸计的传统拉伸试验装置上为 1.97%，在小型实验室拉伸试验装置上为 1.56%。在较小的力和较小的伸长率区域，弹性模量测量的不确定度具有较高的值，这主要是由于测量仪器的缺陷造成的。